[R-sig-ME] How to find ACF, PACF, Sample Variance-Covariance Matrix of Random-Effects?

[Sun, John]

Dear All,

I am writing to ask how to compute the (partial) autocorrelation of random-effects versus lag, and sample-variance covariance matrix of the random-effects given some data without specification of some model or structure on the random-effects covariance matrix. 

Best regards,
John